Hi! When I checked at day 16 they looked pretty good. This is my first time hatching eggs so I'm not sure what to look for but the size looked larger. I didn't realize I was suppose to keep track of the aircells but just comparing from my past candling the size has gotten bigger. I'm afraid to keep checking because I don't want to disturb the eggs too much. I've read so much info I'm so afraid that I'm going to do something wrong.